Pressure device for boiler feed-pumps.



G. R. HENDERSON.

PRESSURE DEVICE FOR BOILER FEED PUMPS.

APPLICATION FILED MAYII, I9I5. Iml. Patented July 27, 1915.

2 SHEETS-SHEET I.

CDLUMBIA PLANOGRAFH C0..WASHINGTON. D,c.

G. R. HENDERSON.

PRESSURE DEVICE FOR BOILER FEED PUMPS.

APPLlCATION FILED MAY1l,19l5.

Patented July 27, 1915.

2 SHEETSSHEET 2.

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nrr .ar para op.

GEORGE R'. HENDERSON, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TOITI-IE BALDWIN LOCOIVIOTIVE WORKS, OF PHILADELPHIA, PENNSYLVANIA, A CORPO- RATION OF PENNSYLVANIA.

PRESSURE DEVICE FOR BOILER FEED-PUMPS.

Application filed May 11, 1915.

To all whom it may concern.'

Be it known that I, GEORGE R. HENDER- soN, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Pressure Devices for Boiler Feed-Pumps, of which the following is a specilication.

One object of my invention is to maintain a pressure in the suction chamber of a boiler feed pump in order to prevent vaporization of the hot water delivered to the pump, which would prevent the proper working of the pump.

A further object of the invention is to operate an injector by the exhaust steam, or steam at a low pressure, in order to provide suflicient head to keep the pumps properly primed to overcome the frictional resistance of the pipe or the lack of head due to the locomotive running up hill.

rIhe invention is particularly adapted for use in locomotives where the feed water heater is located under the tender and relies wholly on the feed supply of the feed pumps from the tank to the boiler and is usually supplemental to the ordinary injector supply of the locomotive.

In the accompanying drawings: Figure 1 is a side view in diagram of sufficient of a locomotive to illustrate my invention; Fig. 2 is an enlarged view, partly in section, of a portion of the tender and the mechanism to which my invention is applicable; Fig. Sis a sectional view on the line ama, Fig. 2; and Fig. 4 is a view illustrating a modification of my invention.

Referring to the drawings, 1 is the boiler of a locomotive. 2 is the water tank mounted on the tender and 8, 4, and 5 arethe three sets of cylinders by which the locomotive is driven.

Vhile I have illustrated a particular type of locomotive in the drawings, it will be understood that the type may be varied according to circumstances as the invention can be applied to any type, but is particularly applicable to the type of locomotive having a long base.

6 is the cylindrical feed water heater having tubes 7. The tubes of this feed water heater connect with a pipe 8 branching from the exhaust pipe 9 leading from the rear cylinders of the locomotive, in the present instance. The exhaust steam passes Specification of Letters Patent.

Patented .nny av, isis.

Serial No. 27,386.

from the heater 6 to the stack 10 at therear of the tender, Fig. 1. The water circulates around the tubes '7 and is heated to a certain degree before passing to the boiler.

l1 is an injector which communicates through a pipe 12 with the interior of the water-tanks 2 of the tender. A nozzle 13 extends into the mouth of the main injector section 14 and communicates with the pipe 15 which leads from a branch 16 of the exhaust pipe 9. Located in the line of the pipe 15 is a valve casing 17 in which is a 'valve 1S, closing against the exhaust pressure. The valve is held to its seat by the pressure of the water in thetank 2 and the exhaust steam only passes to the injector when the pressure of the exhaust steam overcomes the pressure of the water in the tank, lifting the valve olf of its seat. This draws the water from the tank 2 and delivers it into the feed water heater through the pipe 19, valve 20, and pipe 21 passing through a head 22, Fig. 3, which communicates with the neck 24 of the feed water heater 6. The valve 20 is a hand operated cut off valve so as to close communication between the pipes 19 and 21, when desired. In the head 22 is an opening 25 closed by a hand operated valve 26, the handle 27 of which extends through the casing of the tank and has a hand hold 28 at its upper end which can be operated so that the valve can be opened or Vclosed to allow the water to flow directly from the tender tank 2 into the feed water heater without passing through the injector so that if anything causes the stoppage of the injector, or if the valve is closed for any reason, then, on opening the valve 26, the feed water heater has direct communication with the tank, as hereinbefore stated. If, for any reason, the pumps are not working while steam is being supplied to the injector, the valve 18 will be operated automatically when the excessive pressure in the pipe 19, caused by the shutting down of the pumps, exerts its influence.

As illustrated in Fig. 2, in the upper portion of the valve is a cylinder 17 a in which is a piston 40 and between the piston and a shoulder on the cylinder is a spring 41. `A rod connects the piston 40 with the valve 18. In the pipe 19 is a check valve 42 and a pipe 43 forms communication between the pipe 19 beyond the check valve 42 and the upper end of the cylinder 17a inv which the piston 40 is located so that when an excess of pressure is in the pipe 19 it is transmitted tothe piston 40 and closes the valve against the pressure of the spring 41 so that the exhaust from the pipe 9 is cut olf from the injector 11 until the pressure in the pipe 19 becomes reduced by the operation of therpump's at which `time the spring 11 will 4immediately liftthe valve off of its seat, allowing the exhaust steam to pass to the injector. Y

1n some instances, instead of having the valve 18 operate automatically, it may be operated manually from the cab, as illustrated in Fig. 4. A handlel 29 in the cab, or at the front of the tender, is attached to a rod30 connected to an arm 31 which is mounted on a rock shaft having an arm 32 connected by a rod 33 to an arm 34 on a rock shaft 35 which has an arm. This arm is connected to the stem 37 of the valve 181.

The stem 37 has a certain amount of lost motion in the valve 18a, as clearly shown in Fig. 1, so that while the valve can be moved off of its seat independently of the valve Astem by the pressure in the pipe 15, it can be held to its seat when the above described mechanism is manually operated so as to cut out the injector.

The feed water heater is connected through a pipe 38 to a pump 39 on the frame of the locomotive. This pump is shown in the drawings as located back of the second cylinder, but it may be placed at any convenient point en the locomotive.

By the above description, it will be seen that water can be carried to the pumps located at the forward end of the locomotive by pressure, utilizing the exhaust steam from one of the cylinders for this purpose andthat the injector can be automatically cut off when desired, or may be cut off by manually operated means, as fully described above. f

I claim:

y1. The combination in means for supplying feed water to a boiler, of a tank; a feed water heater; connection between the tank and the feed water heater; an injector in the connection operated by the exhaust steam;

j and a valve for cutting off the injector from the exhaust steam supply when the pressure in the tank overcomes the pressure of the exhaust steam.

2. The combination in a locomotive, of a boiler; a tender; atank on the tender; a feed water heater, also on the tender; aV pipe forming communication between the tank and the feed water heater; an injector in the pipe a cylinder on the locomotive; an exfhaust pipe leading from the cylinder and connected to the heating section of the feed water heater, said exhaust pipe having a branch; a pipe connecting the branch with the injector; a valve in said pipe closing against the pressure of the exhaust and operating only when the exhaust overcomes the pressure in the tank.

3. The combination in a locomotive, of a boiler; a tender; a water tank on the tender; a feed water heater, also on the tender; a pipe leading from the tank to the feed water heater; an injector in said pipe; a cylinder;

an exhaust pipe leading from the cylinder t and communicating with the heating chamber of the feed water heater; a pipe leading from the injector and connected to a branch of the exhaust pipe; a valve in said last mentioned pipe, said valve closing against the pressure of the exhaust but opening automatically when the pressure of the exhaust overcomes the pressure of the tank, allowing exhaust steam to be projected through the nozzle so as to cause the water to be forced into the feed water heater; and means for holding the valve to its seat independently of the pressure of the tank.

4:. The combination in a locomotive, of a boiler; a tender; a water tank on the tender; a feed water heater, also on the tender; z pipe leading from the tank to the feed water heater; an injector in said pipe; a cylinder; an exhaust pipe leading from the cylinder and communicating` with the heating chamber of the feed water heater; a pipe leading from the injector and connected to a branch of the exhaust pipe; a valve in said last mentioned pipe, said valve closing against the pressuie of the exhaust but opening automatically when the pressure of the exhaust overcomes the pressure of the tank, allowing exhaust steam to be projected through the nozzle so as to cause the water to be forced into the feed water heater; and automatically operated means for holding the valve positively to its seat when it is desired to cut out the injector.

5. rlhe combination in a locomotive, of a boiler; a tender; a tank; a feed water heater; a pipe connecting the feed water heater with the tank; an injector in said pipe; a cylinder; an exhaust from said cylinder communicating with the heating tubes of the feed water heater; a branch in said pipe; a pipe leading from the branch to the injecting nozzle of the injector; a valve in the latter pipe arranged to close against the pressure of the exhaust; means for automa tically closing said valve, the valve being normally free to close automatically; a direct opening from the tank to the feed water heater; and a manually operated valve arranged to close said opening.

GEORGE R. HENDERSON.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents. Washington, D. C.

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